You would need to specify how the data is separated by columns. In your example, it looks more like you’re trying to split up the rows from a single cell. Not sure if splitting rows out is something Excel can do, but UiPath can by splitting the data at newlines.
If myString is your string, assign a variable of type String Array (or String) to myString.Split(newString() {Environment.NewLine}, StringSplitOptions.None).